KR102572255B1 - Coating composition for concrete and coating method using the same - Google Patents

Abstract

Disclosed are a paint composition for protecting concrete and extending its lifespan and a coating method using the same. The paint composition for protecting concrete and extending its lifespan according to one embodiment includes: a first composition prepared to form a first coating layer on concrete; and a second composition prepared to form a second coating layer on the first coating layer, wherein the first composition can include an emulsion composition and a powder composition.

Description

Coating composition and coating method for concrete protection and life extension {COATING COMPOSITION FOR CONCRETE AND COATING METHOD USING THE SAME}

The present disclosure relates to a paint composition for protecting concrete and extending its lifespan and a method for painting concrete using the same.

Conventionally, hardened concrete contains hydrated lime as a hydration product of cement and exhibits strong alkalinity. Hydroxide lime gradually changes to carbonate lime under the influence of carbon dioxide in the air from the surface of concrete with the passage of time and loses its alkalinity. This phenomenon is called concrete neutralization. In order to prevent neutralization of concrete, it is necessary to increase the strength, durability and watertightness of concrete and remove environmental factors.

When carbon dioxide gas or acid rain in the air chemically reacts with calcium hydroxide in concrete to gradually become calcium carbonate (CaCO ₃ ), the alkalinity of concrete is lost and concrete is neutralized. As a result of neutralization of concrete, reinforcing steel is corroded and expansion pressure is generated. When this expansion pressure exceeds the concrete stress, cracks occur, and moisture and carbon dioxide penetrate into the cracks, rapidly deteriorating. In this regard, Korean Patent Registration No. 10-2305325 has proposed a technique for a paint composition for concrete exterior walls.

On the other hand, the outer surface of an outdoor structure such as an apartment or a roof of a building is painted with a colored or colorless paint for the purpose of making the exterior beautiful and waterproofing. These paints may be oil-based or water-based, and recently, water-based paints have been widely used to prevent environmental pollution and civil complaints. These water-based paints are easily discolored by ultraviolet rays and harden and crack over time, so they function as paints. and performance may deteriorate.

Since the currently used water-based paint does not have a long lifespan, frequent re-painting is required, but in the case of painting work, labor costs are excessive, causing an increase in maintenance costs. Therefore, there is an urgent need to develop a technology for maintaining the exterior of a concrete structure for a long time by increasing the durability and weather resistance of a paint coated on an outdoor concrete structure.

The technical idea of the present disclosure is to solve the above problems, and an object thereof is to provide a technique capable of preventing neutralization of concrete.

In addition, the technical spirit of the present disclosure has another object to provide a technology capable of extending the life of a concrete structure.

And, another object of the technical idea of the present disclosure is to provide a technique for improving the physical properties of a paint applied to a concrete structure so that the exterior of the concrete structure can be maintained for a long time.

The problem to be solved by the present invention is not limited to the above problem, and other technical problems not mentioned will be clearly understood by those skilled in the art from the description below.

In order to achieve this object, as an embodiment of the present invention, a coating composition for protecting concrete and extending its lifespan includes a first composition prepared to form a first coating layer on concrete; and a second composition prepared to form a second coating layer on the first coating layer, wherein the first composition may include an emulsion composition and a powder composition.

In addition, the emulsion composition is 70 to 90% by weight of the acrylic emulsion; 5 to 15% by weight of silicone resin emulsion; 0.1 to 2% by weight of a dispersant; 0.02-0.2% by weight of a glidant; 0.1 to 2% by weight of an antifoaming agent; 0.5 to 2% by weight of a film-forming aid; and the balance of water, wherein the powder composition comprises 85 to 95% by weight of cement; And 5 to 15% by weight of quicklime; may include.

And, the second composition is a subject including a silicone-modified (meth)acrylic polyol resin, a pure acrylic resin, and a styrene-based acrylic resin; and a curing agent including aliphatic polyisocyanate and a diluent.

In addition, the silicone-modified (meth)acrylic polyol resin is 30 to 40% by weight of the first propylene glycol monomethyl ether acetate; 0.5 to 2% by weight of single-ended silicon; 20 to 30% by weight of primary methyl methacrylate; 20 to 30% by weight of 1st butyl acrylate; 10 to 20% by weight of first hydroxyethyl methacrylate; 1 to 3% by weight of the first acrylic acid; 0.1 to 1% by weight of the first organic peroxide; and 0.1 to 1% by weight of the first antioxidant, wherein the pure acrylic resin includes 30 to 40% by weight of the second propylene glycol monomethyl ether acetate; 20 to 30% by weight of the second methyl methacrylate; 20-30% by weight of 2nd butyl acrylate; 10 to 20% by weight of the second hydroxyethyl methacrylate; 1 to 3% by weight of the second acrylic acid; 0.1 to 1% by weight of the second organic peroxide; and 0.1 to 1% by weight of the second antioxidant, wherein the styrene-based acrylic resin includes 30 to 40% by weight of tertiary propylene glycol monomethyl ether acetate; 10 to 20% by weight of styrene monomer; 20 to 30% by weight of tertiary butyl acrylate; 10 to 20% by weight of third hydroxyethyl methacrylate; 10 to 15% by weight of the third acrylic acid; 5 to 10% by weight of epoxysilane; 0.1 to 1% by weight of the third organic peroxide; and 0.1 to 1% by weight of the third antioxidant.

In addition, the one-end silicone may be polydimethylsiloxane having a methacryloxy group bonded to one end.

As another embodiment of the present invention to achieve this object, a coating method for protecting concrete and extending its lifespan includes forming a first coating layer by coating the above-described first composition on the surface of concrete to form a first coating layer; and a second coating layer forming step of forming a second coating layer by coating the above-described second composition on the first coating layer.

In addition, the painting method for protecting concrete and extending its lifespan includes a pretreatment step of removing at least one of foreign matter and old coating film present in the area to be painted; And a repair step of repairing the cracked portion; may further include.

The solutions to the problems described above are merely illustrative and should not be construed as limiting the present invention. In addition to the exemplary embodiments described above, there may be additional embodiments described in the drawings and detailed description.

As described above, according to various embodiments of the present invention, adhesion, water resistance, storage resistance, adhesiveness, odor, hardness, appearance, miscibility, adhesion strength, weather resistance, alkali resistance, salt water resistance, It has excellent physical properties such as water permeability and crack resistance.

In addition, according to various embodiments of the present invention, since a coating layer is formed on the surface of the concrete by painting the paint composition, absorption of water into a small amount of capillaries present in the concrete is minimized and adhesion and durability are improved. It forms an anti-neutralization layer from the concrete matrix, and can prevent corrosion of reinforcing bars due to its excellent flame resistance.

In addition, the paint composition according to various embodiments of the present invention penetrates the concrete matrix during application and improves physical and chemical properties such as tensile strength, compressive strength, acid resistance, and alkali resistance of the concrete, so that even if the concrete is damaged by impact, a certain period of time It is possible to prevent neutralization of abnormal concrete.

In addition, since the coating composition according to various embodiments of the present invention has strong adhesion to concrete, the neutralization depth of the coating film formed by the coating composition is 1 mm or less, and the chloride ion penetration resistance is excellent, it can effectively prevent the exterior wall of the building from being neutralized. can

In addition, according to various embodiments of the present invention, the second coating layer has excellent adhesion to the first coating layer, and excellent weather resistance and stain resistance, so that it can be self-cleaned with a small amount of water, and the oil stain on the coating film is almost eliminated. It is not attached and can contribute to extending the life of concrete structures.

The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

1 is a flowchart schematically illustrating a coating method using a coating composition according to an embodiment of the present invention.

A preferred embodiment of the present invention will be described in more detail with reference to the accompanying drawings, but the already well-known technical parts will be omitted or compressed for conciseness of description.

It should be noted that references herein to “one” or “an” embodiment of the invention are not necessarily to the same embodiment, they mean at least one.

In the following embodiments, terms such as first and second are used for the purpose of distinguishing one component from another component without limiting meaning.

In the following examples, expressions in the singular number include plural expressions unless the context clearly indicates otherwise.

In the following embodiments, terms such as include or have mean that features or elements described in the specification exist, and do not preclude the possibility that one or more other features or elements may be added.

When an embodiment is otherwise implementable, a specific process sequence may be performed differently from the described sequence. For example, two processes described in succession may be performed substantially simultaneously, or may be performed in an order reverse to the order described. That is, each step of the method described herein may be suitably performed in any order unless otherwise stated in the specification or clearly contradicted by context.

<Description of paint composition for concrete protection and life extension>

A coating composition for protecting concrete and extending lifespan according to an embodiment may include a first composition and a second composition. The first composition according to an embodiment is for forming a first coating layer on the surface of concrete, and may include an emulsion composition and a powder composition.

In one embodiment, the first composition may be prepared by mixing the emulsion composition and the powder composition at a constant weight ratio. Specifically, the emulsion composition and the powder composition may be mixed in a weight ratio of 9:9 to 9:11 (eg, 9:9, 9:10, 9:11). If the weight ratio of the emulsion composition and the powder composition is less than 9:9 (for example, 9:8), the hardness and adhesion strength of the coating film may decrease, and if the weight ratio exceeds 9:11 (for example, 9:12) has a problem in that it is difficult to prevent neutralization and deterioration of concrete due to a decrease in adhesion strength, so it is preferable that the weight ratio of the emulsion composition and the powder composition is applied within the above-mentioned range when preparing the first composition.

In one embodiment, the emulsion composition may include an acrylic emulsion, a silicone resin emulsion, a dispersing agent, a fluidizing agent, an antifoaming agent, a film-forming aid, and water. In one embodiment, the content of the acrylic emulsion may be applied at 70 to 90% by weight. As a specific example, the content of the acrylic emulsion is 70% by weight, 71% by weight, 72% by weight, 73% by weight, 74% by weight, 75% by weight, 76% by weight, 77% by weight, 78% by weight, 79% by weight, 80 81 wt%, 82 wt%, 83 wt%, 84 wt%, 85 wt%, 86 wt%, 87 wt%, 88 wt%, 89 wt% or 90 wt%. In addition, the content of the acrylic emulsion may be in the range of one or more of the above numerical values and one or less of the above numerical values.

For example, the content range of the acrylic emulsion is 70% to 73% by weight, 71% to 74% by weight, 72% to 75% by weight, 73% to 76% by weight, 74% to 77% by weight, 75 wt% to 78 wt%, 76 wt% to 79 wt%, 80 wt% to 85 wt%, 83 wt% to 90 wt%, or 70 wt% to 90 wt% may be provided. Acrylic emulsion according to an embodiment can maintain the physical properties of the coating film at an excellent level within the above range.

If the acrylic emulsion is less than 70% by weight, there is a concern that coating film adhesion and storability may be deteriorated, and if it exceeds 90% by weight, the hardness may deteriorate, so the content of the acrylic emulsion is preferably applied within the above range. .

And, the acrylic emulsion is methyl methacrylate monomer, n-butyl acrylate monomer, n-butyl methacrylate monomer, 2-ethylhexyl acrylate monomer, acrylic acid monomer, dimethylaminoethyl methacrylate monomer, lauryl methacrylate monomers, 2-hydroxyethylmethacrylate monomers, nonionic surfactants and epoxy silanes. In one embodiment, the acrylic emulsion is methyl methacrylate monomer, n-butyl acrylate monomer, n-butyl methacrylate monomer, 2-ethylhexyl acrylate monomer, acrylic acid monomer, dimethylaminoethyl methacrylate monomer, lauryl meth It is prepared by mixing a acrylate monomer, 2-hydroxyethyl methacrylate monomer, a nonionic surfactant, and an epoxy silane with water and an initiator (eg, potassium persulfate), heating to a constant temperature, and copolymerizing through stirring, or commercially available A product on sale (eg, DOW's PRIMAL AC-261P) may be used.

In one embodiment, 20 to 50% by weight of methyl methacrylate monomer for acrylic emulsion may be applied. If the content of the methyl methacrylate monomer is less than 20% by weight, adhesion at the time of painting is reduced, and if it exceeds 50% by weight, there is a concern that the coating film hardness is reduced. In one embodiment, n-butylacrylate monomer for acrylic emulsion may be applied in an amount of 30 to 60% by weight. If the content of the n-butyl acrylate monomer is less than 30% by weight, the viscosity increases and painting workability deteriorates, and if it exceeds 60% by weight, coating film adhesion or hardness may decrease. In one embodiment, n-butyl methacrylate monomer for acrylic emulsion may be applied in an amount of 2 to 10% by weight. If the content of the n-butyl methacrylate monomer is less than 2% by weight, adhesion is deteriorated, and if it exceeds 10% by weight, painting workability may be deteriorated. In one embodiment, 2-ethylhexylacrylate monomer for acrylic emulsion may be applied in an amount of 2 to 10% by weight. If the content of the 2-ethylhexyl acrylate monomer is less than 2% by weight, the adhesiveness may deteriorate, and if it exceeds 10% by weight, water resistance may deteriorate. In one embodiment, the acrylic acid monomer for the acrylic emulsion may be applied in an amount of 2 to 10% by weight. If the content of the acrylic acid monomer is less than 2% by weight, adhesion may be deteriorated, and if it exceeds 10% by weight, weather resistance may be deteriorated. In one embodiment, dimethylaminoethyl methacrylate monomer for acrylic emulsion may be applied in an amount of 2 to 10% by weight. When the content of the dimethylaminoethyl methacrylate monomer is less than 2% by weight, the adhesiveness is lowered, and when it exceeds 10% by weight, there is a possibility that the hardness is lowered. In one embodiment, the lauryl methacrylate monomer for acrylic emulsion may be applied in an amount of 2 to 10% by weight. If the content of the lauryl methacrylate monomer is less than 2% by weight, it is difficult to adjust the viscosity to an appropriate level, and if it exceeds 10% by weight, there is a concern that the coating film hardness may decrease. In one embodiment, 2-hydroxyethyl methacrylate monomer for acrylic emulsion may be applied in an amount of 2 to 10% by weight. If the content of 2-hydroxyethyl methacrylate monomer is less than 2% by weight, the coating film adhesion may decrease, and if it exceeds 10% by weight, the coating film hardness may decrease. In one embodiment, the nonionic surfactant for the acrylic emulsion (eg, polyoxyethylene octyl ether) may be applied in an amount of 1 to 10% by weight. If the content of the nonionic surfactant is less than 1% by weight, it is difficult to emulsify and prepare an emulsion, and if it exceeds 10% by weight, storage stability may be deteriorated. In one embodiment, the epoxy silane for acrylic emulsion is a silane coupling agent having an epoxy group (eg, 3-glycidoxypropyltrimethoxysilane), and the content thereof may be applied in an amount of 0.1 to 0.5% by weight. If the content of epoxy silane is less than 0.1% by weight, coating film adhesion may deteriorate, and if it exceeds 0.5% by weight, coating film hardness may decrease. In one embodiment, as a nonionic surfactant included in the acrylic emulsion, miscibility with cement may be maximized by applying a nonionic surfactant having a high added mole number of ethylene oxide.

In one embodiment, the acrylic emulsion may have a glass transition temperature of -5°C to 20°C (eg, -5°C, 0°C, 5°C, 10°C, 15°C or 20°C). If the glass transition temperature of the acrylic emulsion is higher than 20 ° C, the coating film is easily broken, and if it is lower than -5 ° C, the stickiness of the coating film may become severe.

In one embodiment, the content of the silicone resin emulsion may be applied at 5 to 15% by weight. As a specific example, the content of the silicone resin emulsion is 5% by weight, 6% by weight, 7% by weight, 8% by weight, 9% by weight, 10% by weight, 11% by weight, 12% by weight, 13% by weight, 14% by weight or 15% by weight may be provided. In addition, the content of the silicone resin emulsion may be in a range of one or more of the above numerical values and less than one of the above numerical values.

For example, the content range of the silicone resin emulsion is 5% to 8% by weight, 6% to 9% by weight, 7% to 10% by weight, 8% to 11% by weight, 9% to 12% by weight , 10 wt% to 13 wt%, 11 wt% to 14 wt%, 12 wt% to 15 wt%, or 5 wt% to 15 wt% may be provided. The silicone resin emulsion according to one embodiment can maintain the physical properties of the coating film at an excellent level within the above range.

If the silicone resin emulsion is less than 5% by weight, the coating film adhesion may deteriorate and the mechanical properties of the coating film may deteriorate, and if it exceeds 15% by weight, the content of other components is relatively reduced, causing a decrease in overall physical properties Therefore, the content of the silicone resin emulsion is preferably applied within the aforementioned range.

And, in one embodiment, the silicone resin emulsion is prepared by a condensation reaction of siloxane after hydrolysis and alcoholization of silane, tetraethoxy silane, methyltrimethoxy silane, water, a nonionic surfactant (for example, Polyoxyalkylene alkylphenol ether) and isopropyl alcohol may be mixed and stirred at a constant temperature, or a commercially available product (eg, Wacker's SILRES® BS 45) may be used.

In one embodiment, the silicone resin emulsion may have a weight average molecular weight of 2,000 to 3,000 g/mol, and the remaining reactive groups in the silicone resin emulsion may be cross-linked by a condensation reaction. In addition, the silicone resin emulsion contains a trifunctional subunit (T) having three Si-O bonds and a tetrafunctional subunit (Q) having four Si-O bonds, thereby obtaining a dense network structure and high hardness. there is.

In one embodiment, the dispersant may be applied as a non-ionic surfactant (eg, polyoxyethylene-11-decyl ether), or a commercially available product (eg, BASF's Lutensol) may be used.

In one embodiment, the content of the dispersant may be applied at 0.1 to 2% by weight. As a specific example, the content of the dispersant is 0.1% by weight, 0.3% by weight, 0.5% by weight, 0.7% by weight, 0.9% by weight, 1% by weight, 1.3% by weight, 1.5% by weight, 1.7% by weight, 1.9% by weight or 2% by weight. % can be provided. Also, the content of the dispersant may be in a range of one or more of the above values and less than one of the above values.

For example, the content range of the dispersant is 0.1 to 0.5% by weight, 0.2 to 0.6% by weight, 0.3 to 0.7% by weight, 0.4 to 0.8% by weight, 0.5 to 0.9% by weight, 0.6 to 1% by weight, 0.7 to 1.1% by weight. , 0.8 to 1.2% by weight, 0.9 to 1.3% by weight, 1 to 1.4% by weight, 1.1 to 1.5% by weight, 1.2 to 1.6% by weight, 1.3 to 1.7% by weight, 1.4 to 1.8% by weight, 1.5 to 1.9% by weight, 1.6 to 2% by weight or 0.1 to 2% by weight. The dispersant according to one embodiment may maintain the physical properties of the coating film at an excellent level within the above range.

If the content of the dispersant is less than 0.1% by weight, the dispersibility is lowered, and if it exceeds 2% by weight, the dispersion stability is lowered due to excessive addition, which may negatively affect the physical properties of the coating film. It is preferable to apply within the range.

In one embodiment, the glidant imparts fluidity to the paint, and a commercially available product (eg, Solvay's RHODOLINE® WA 2801) may be used. In one embodiment, the amount of glidant may be applied in an amount of 0.02 to 0.2% by weight. As a specific example, the amount of the fluidizing agent may be set to 0.02% by weight, 0.05% by weight, 0.1% by weight or 0.2% by weight. In addition, the amount of glidant may range from one or more of the above values and less than or equal to one of the above values.

For example, the content range of the glidant may be set to 0.02 wt% to 0.1 wt%, 0.05 wt% to 0.2 wt%, or 0.02 wt% to 0.2 wt%. The fluidizing agent according to one embodiment can maintain the physical properties of the coating film at an excellent level within the above range.

If the amount of the glidant is less than 0.02% by weight, it is difficult to control the viscosity, and if the amount exceeds 0.2% by weight, the viscosity of the paint is excessively low, which reduces workability during painting and may negatively affect the properties of the coating film. is preferably applied within the aforementioned range.

In one embodiment, a commercially available product (eg, Evonik's Foamex-10) may be used as the antifoaming agent. In addition, the content of the antifoaming agent may be applied at 0.1 to 2% by weight. As a specific example, the content of the antifoaming agent is 0.1% by weight, 0.3% by weight, 0.5% by weight, 0.7% by weight, 0.9% by weight, 1% by weight, 1.3% by weight, 1.5% by weight, 1.7% by weight, 1.9% by weight or 2% by weight. % can be provided. In addition, the amount of the antifoaming agent may range from one or more of the above values to less than one of the above values.

For example, the content range of the antifoam agent is 0.1 to 0.5% by weight, 0.2 to 0.6% by weight, 0.3 to 0.7% by weight, 0.4 to 0.8% by weight, 0.5 to 0.9% by weight, 0.6 to 1% by weight, 0.7 to 1.1% by weight. , 0.8 to 1.2% by weight, 0.9 to 1.3% by weight, 1 to 1.4% by weight, 1.1 to 1.5% by weight, 1.2 to 1.6% by weight, 1.3 to 1.7% by weight, 1.4 to 1.8% by weight, 1.5 to 1.9% by weight, 1.6 to 2% by weight or 0.1 to 2% by weight. The antifoaming agent according to an embodiment may maintain the physical properties of the coating film at an excellent level within the above range.

If the content of the antifoamer is less than 0.1% by weight, there is a problem in that many bubbles are generated, and if it exceeds 2% by weight, it may act as a foreign substance when mixed with the powder composition and adversely affect the properties of the coating film. It is preferably applied within one range.

In one embodiment, the film-forming aid can increase adhesion by making the film more dense and improving wettability to the substrate when forming the film. A commercially available product (for example, EASTMAN's Texanol) may be used as the film forming agent. In addition, the content of the film forming aid may be applied at 0.5 to 2% by weight.

As a specific example, the content of the film-forming aid may be 0.5% by weight, 0.8% by weight, 1.1% by weight, 1.4% by weight, 1.7% by weight or 2% by weight. In addition, the content of the film-forming auxiliary may be in the range of one or more of the above values and one or less of the above values.

For example, the content range of the film forming aid is 0.5 to 0.9% by weight, 0.6 to 1% by weight, 0.7 to 1.1% by weight, 0.8 to 1.2% by weight, 0.9 to 1.3% by weight, 1 to 1.4% by weight, 1.1 to 1.5% by weight. %, 1.2 to 1.6% by weight, 1.3 to 1.7% by weight, 1.4 to 1.8% by weight, 1.5 to 1.9% by weight, 1.6 to 2% by weight or 0.5 to 2% by weight. The film forming aid according to an embodiment can maintain the physical properties of the coating film at an excellent level within the above range.

If the film-forming aid is less than 0.5% by weight, there is a risk of cracking the coating film when painting at a low temperature of 10 ° C or less, and if it exceeds 2% by weight, the drying time is too slow, which may cause problems with workability. is preferably applied within the aforementioned range.

The emulsion composition according to one embodiment includes water, and the amount of water may be applied by subtracting the contents of the remaining ingredients except water from 100% by weight of the total amount of the emulsion composition.

Meanwhile, in one embodiment, the powder composition may include cement and quicklime. In one embodiment, the content of cement may be applied at 85 to 95% by weight. As specific examples, the content of cement is 85% by weight, 86% by weight, 87% by weight, 88% by weight, 89% by weight, 90% by weight, 91% by weight, 92% by weight, 93% by weight, 94% by weight or 95% by weight. % can be provided. Also, the amount of cement may be in a range of more than one of the above values and less than one of the above values.

For example, the content range of cement is 85% to 88% by weight, 86% to 89% by weight, 87% to 90% by weight, 88% to 91% by weight, 89% to 92% by weight, 90 It may be provided as 93 wt% to 91 wt%, 91 wt% to 94 wt%, 92 wt% to 95 wt%, or 85 wt% to 95 wt%. Cement according to one embodiment can maintain the physical properties of the coating film at an excellent level within the above range.

If the cement content is less than 85% by weight, mechanical properties including hardness of the coating film may be deteriorated, and if it exceeds 95% by weight, miscibility during stirring of the emulsion composition and the powder composition is deteriorated, which negatively affects the overall physical properties of the coating film. Therefore, the content of cement is preferably applied within the above range.

In addition, in one embodiment, the powder degree of cement may be applied at 3300 ~ 6000 cm 2 / g. As a specific example, the fineness of cement may be 3300 cm 2 /g, 3700 cm 2 /g, 4100 cm 2 /g, 4500 cm 2 /g, 5000 cm 2 /g, 5500 cm 2 /g or 6000 cm 2 /g. Also, the fineness of the cement may be in a range of more than one of the above values and less than one of the above values.

For example, the fineness range of cement is 3300 to 4100 cm2/g, 3700 to 4500 cm2/g, 4100 to 5000 cm2/g, 4500 to 5500 cm2/g, 5000 to 6000 cm2/g or 3300 to 6000 cm2/g. g can be applied. The fineness of the cement according to one embodiment can maintain the physical properties of the coating film at an excellent level within the above range.

If the fineness of the cement is less than 3300cm2/g, the hydration reaction is slow, the initial strength is lowered, it is difficult for the cement to penetrate into the concrete substrate, and there is a risk of lowering the adhesion strength. It is preferable to apply the cement powder within the above-mentioned range because it may have a negative effect on chemical conversion.

In one embodiment, the content of quicklime may be applied at 5 to 15% by weight. As a specific example, the content of quicklime is 5% by weight, 6% by weight, 7% by weight, 8% by weight, 9% by weight, 10% by weight, 11% by weight, 12% by weight, 13% by weight, 14% by weight or 15% by weight. % can be provided. Also, the amount of quicklime may be in a range of one or more of the above values and less than or equal to one of the above values.

For example, the content range of quicklime is 5% to 9% by weight, 6% to 10% by weight, 7% to 11% by weight, 8% to 12% by weight, 9% to 13% by weight, 10% by weight It may be provided in weight % to 14 weight %, 11 weight % to 15 weight %, or 5 weight % to 15 weight %. Quicklime according to an embodiment can maintain the physical properties of the coating film at an excellent level within the above range.

If the amount of quicklime is less than 5% by weight, the hydration reaction is not smooth and the durability of the coating film may be lowered. Therefore, it is preferable that the content of quicklime is applied within the above range.

In one embodiment, the second composition is for forming a second coating layer on the first coating layer, and may include a base material and a curing agent. According to one embodiment, the base material and the curing agent are 6:1 to 7.5:1 (e.g., 6:1, 6.1:1, 6.2:1, 6.3:1, 6.4:1, 6.5:1, 6.6:1, 6.7:1, 6.8:1, 6.9:1, 7:1, 7.1:1, 7.2:1, 7.3:1, 7.4:1 or 7.5:1). If the weight ratio of the main agent and the curing agent is less than 6:1 (for example, 5:1) or exceeds 7.5:1 (for example, 8:1), the curing reaction is not smooth and the physical properties of the second coating layer may adversely affect

The subject according to an embodiment is a silicone-modified (meth)acrylic polyol resin, a pure acrylic resin, a styrene-based acrylic resin, a subject dispersing agent, a subject thickening agent, a subject color pigment, a subject extender pigment, a subject diluent, and a subject antifoaming agent. can include

In the present specification, the silicone-modified (meth)acrylic polyol resin refers to a silicone-modified acrylic polyol resin or a silicone-modified methacrylic polyol resin. In addition, in the present specification, pure acrylic resin means that the silicone component is not included in the acrylic resin.

In one embodiment, the content of the silicone-modified (meth)acrylic polyol resin may be applied in an amount of 45 to 55% by weight based on the total weight of the subject (ie, based on 100% by weight, which is the total weight of the subject). As a specific example, the content of the silicone-modified (meth)acrylic polyol resin is 45% by weight, 46% by weight, 47% by weight, 48% by weight, 49% by weight, 50% by weight, 51% by weight, 52% by weight, 53% by weight , 54% by weight or 55% by weight. In addition, the content of the silicone-modified (meth)acrylic polyol resin may be in the range of one or more of the above numerical values and one or less of the above numerical values.

For example, the content of the silicone-modified (meth)acrylic polyol resin is 45% to 50% by weight, 46% to 51% by weight, 47% to 52% by weight, 48% to 53% by weight, 49% by weight to 54 wt%, 50 wt% to 55 wt%, or 45 wt% to 55 wt%. The silicone-modified (meth)acrylic polyol resin according to one embodiment can maintain the physical properties of the coating film at an excellent level within the above range.

If the silicone-modified (meth)acrylic polyol resin is less than 45% by weight, the water repellency of the coating film is lowered, and the effect of preventing neutralization of concrete is lowered, or the adhesive strength with the undercoat film is lowered, resulting in peeling of the coating film. If it is exceeded, the content of the pure acrylic resin and the styrene-based acrylic resin is relatively reduced, and thus the overall physical properties of the coating film may be deteriorated, the appearance of the coating film may be deteriorated, or the curing property may be deteriorated. It is preferable to apply within the range.

According to one embodiment, the silicone-modified (meth)acrylic polyol resin is first propylene glycol monomethyl ether acetate, one-end silicone, first methyl methacrylate, first butyl acrylate, first hydroxyethyl methacrylate, It may be prepared by polymerizing the first acrylic acid, the first organic peroxide, and the first antioxidant.

In one embodiment, the content of the first propylene glycol monomethyl ether acetate may be applied at 30 to 40% by weight. As a specific example, the content of the first propylene glycol monomethyl ether acetate is 30% by weight, 31% by weight, 32% by weight, 33% by weight, 34% by weight, 35% by weight, 36% by weight, 37% by weight, 38% by weight , 39% by weight or 40% by weight may be provided. In addition, the content of the first propylene glycol monomethyl ether acetate may be in the range of one or more of the above values and one or less of the above values.

For example, the content range of the first propylene glycol monomethyl ether acetate is 30% to 35% by weight, 31% to 36% by weight, 32% to 37% by weight, 33% to 38% by weight, 34% by weight % to 39% by weight, 35% to 40% by weight or 30% to 40% by weight. The first propylene glycol monomethyl ether acetate according to an embodiment can maintain the physical properties of the coating film at an excellent level within the above range.

If the first propylene glycol monomethyl ether acetate is less than 30% by weight, the polymerization reaction is not smooth, and the yield of the silicone-modified (meth)acrylic polyol resin may decrease, and if it exceeds 40% by weight, the content of other components is relatively low. As this decreases, physical properties such as water repellency and adhesion of the silicone-modified (meth)acrylic polyol resin may deteriorate. Therefore, the content of the first propylene glycol monomethyl ether acetate is preferably applied within the above range.

In one embodiment, the silicone at one end may be applied as polydimethylsiloxane having a methacryloxy group bonded to one end. Here, the single end means one end of both ends. In one embodiment, the single-end silicone has a weight average molecular weight of 10000 g / mol, and may be applied as polydimethylsiloxane having a methacryloxy group bonded to one end, and an n-butyl group bonded to the other end of the polydimethylsiloxane. . That is, the one-end silicone according to an embodiment is one in which a methacryloxy group is bonded to only one end of both ends of polydimethylsiloxane, and silicone polymerized using such one-end silicone (for example, FM0725 from J&C) The modified (meth)acrylic polyol resin can realize excellent water repellency as a top coat, and can contribute to improving physical properties such as durability, stain resistance, adhesion, and weather resistance of the second coating layer.

According to one embodiment, the content of the silicon at one end may be applied at 0.5 to 2% by weight. As a specific example, the content of the silicon at one end may be 0.5% by weight, 0.8% by weight, 1.1% by weight, 1.4% by weight, 1.7% by weight or 2% by weight. In addition, the content of the silicon at one end may be in a range of one or more of the above values and less than one of the above values.

For example, the content range of the single-ended silicone is 0.5 to 0.9% by weight, 0.6 to 1% by weight, 0.7 to 1.1% by weight, 0.8 to 1.2% by weight, 0.9 to 1.3% by weight, 1 to 1.4% by weight, 1.1 to 1.5% by weight. 1.2 to 1.6% by weight, 1.3 to 1.7% by weight, 1.4 to 1.8% by weight, 1.5 to 1.9% by weight, 1.6 to 2% by weight or 0.5 to 2% by weight. One-end silicon according to an embodiment can maintain the physical properties of the coating film at an excellent level within the above range.

If the amount of silicone at one end is less than 0.5% by weight, the water repellency of the coating film may decrease, and if it exceeds 2% by weight, the compatibility with other components may decrease, which may negatively affect the physical properties of the coating film. The content of is preferably applied within the aforementioned range.

In one embodiment, the content of the first methyl methacrylate may be applied at 20 to 30% by weight. As a specific example, the content of the first methyl methacrylate is 20% by weight, 21% by weight, 22% by weight, 23% by weight, 24% by weight, 25% by weight, 26% by weight, 27% by weight, 28% by weight, 29% by weight It may be provided at 30% by weight or 30% by weight. In addition, the content of the first methyl methacrylate may be in the range of one or more of the above values and one or less of the above values.

For example, the content range of the first methyl methacrylate is 20% to 25% by weight, 21% to 26% by weight, 22% to 27% by weight, 23% to 28% by weight, 24% to 24% by weight 29 wt%, 25 wt% to 30 wt%, or 20 wt% to 30 wt% may be provided. The first methyl methacrylate according to an embodiment may maintain the physical properties of the coating film at an excellent level within the above range.

If the amount of primary methyl methacrylate is less than 20% by weight, the adhesiveness decreases, and if it exceeds 30% by weight, there is a concern that the hardness of the coating film may decrease. Therefore, the content of primary methyl methacrylate is applied within the above range it is desirable to be

In one embodiment, the content of the first butyl acrylate (eg, n-butyl acrylate) may be applied in an amount of 20 to 30% by weight. As a specific example, the content of the first butyl acrylate is 20% by weight, 21% by weight, 22% by weight, 23% by weight, 24% by weight, 25% by weight, 26% by weight, 27% by weight, 28% by weight, 29% by weight % or 30% by weight. In addition, the content of the first butyl acrylate may be a range of one or more of the above numerical values and one or less of the above numerical values.

For example, the content range of the first butyl acrylate is 20% to 25% by weight, 21% to 26% by weight, 22% to 27% by weight, 23% to 28% by weight, 24% to 29% by weight % by weight, 25% by weight to 30% by weight or 20% by weight to 30% by weight may be provided. The first butyl acrylate according to one embodiment can maintain the physical properties of the coating film at an excellent level within the above range.

If the content of primary butyl acrylate is less than 20% by weight, the viscosity of the paint increases and painting workability deteriorates, and if it exceeds 30% by weight, the coating film adhesion or hardness may decrease, so the content of primary butyl acrylate is preferably applied within the aforementioned range.

In one embodiment, the content of the first hydroxyethyl methacrylate (eg, 2-hydroxyethyl methacrylate) may be applied in an amount of 10 to 20% by weight. As a specific example, the content of the first hydroxyethyl methacrylate is 10% by weight, 11% by weight, 12% by weight, 13% by weight, 14% by weight, 15% by weight, 16% by weight, 17% by weight, 18% by weight , 19% by weight or 20% by weight may be provided. In addition, the content of the first hydroxyethyl methacrylate may be in the range of one or more of the above values and one or less of the above values.

For example, the content range of the first hydroxyethyl methacrylate is 10% to 15% by weight, 11% to 16% by weight, 12% to 17% by weight, 13% to 18% by weight, 14% by weight % to 19 wt%, 15 wt% to 20 wt%, or 10 wt% to 20 wt% may be provided. The first hydroxyethyl methacrylate according to an embodiment can maintain the physical properties of the coating film at an excellent level within the above range.

If the first hydroxyethyl methacrylate is less than 10% by weight, the coating film adhesion is lowered, and if it exceeds 20% by weight, there is a concern that the coating film hardness is lowered. It is preferably applied within one range.

In one embodiment, the content of the first acrylic acid may be applied at 1 to 3% by weight. As a specific example, the content of the first acrylic acid may be provided as 1% by weight, 2% by weight or 3% by weight. In addition, the content of the first acrylic acid may be in the range of one or more of the above values and one or less of the above values.

For example, the content range of the first acrylic acid may be provided as 1 wt% to 2 wt%, 2 wt% to 3 wt%, or 1 wt% to 3 wt%. The first acrylic acid according to an embodiment can maintain the physical properties of the coating film at an excellent level within the above range.

If the first acrylic acid is less than 1% by weight, the coating film adhesion is deteriorated, and if it exceeds 3% by weight, weather resistance may be deteriorated. Therefore, the content of the first acrylic acid is preferably applied within the above-mentioned range.

In one embodiment, the content of the first organic peroxide (eg, benzoyl peroxide) may be applied in an amount of 0.1 to 1% by weight. As a specific example, the content of the first organic peroxide may be 0.1% by weight, 0.5% by weight or 1% by weight. In addition, the content of the first organic peroxide may be in a range of one or more of the above values and one or less of the above values.

For example, the content range of the first organic peroxide may be 0.1 wt% to 0.5 wt%, 0.5 wt% to 1 wt%, or 0.1 wt% to 1 wt%. The first organic peroxide according to an embodiment can maintain the physical properties of a coating film at an excellent level within the above range.

If the amount of the first organic peroxide is less than 0.1% by weight, the degree of crosslinking of the polymer is too low, and if it exceeds 1% by weight, the degree of crosslinking is too high, so there is a problem of deterioration in physical properties of the coating film. Therefore, the content of the first organic peroxide is within the above-mentioned range. It is preferable to apply in

In one embodiment, the content of the first antioxidant (eg, benzophenone) may be applied at 0.1 to 1% by weight. As a specific example, the content of the first antioxidant may be 0.1% by weight, 0.5% by weight or 1% by weight. In addition, the content of the first antioxidant may be in the range of one or more of the above values and one or less of the above values.

For example, the content range of the first antioxidant may be 0.1 wt% to 0.5 wt%, 0.5 wt% to 1 wt%, or 0.1 wt% to 1 wt%. The first antioxidant according to an embodiment may maintain the physical properties of the coating film at an excellent level within the above range.

If the amount of the first antioxidant is less than 0.1% by weight, the weatherability of the coating film may deteriorate, and if it exceeds 1% by weight, the overall properties of the coating film may be adversely affected. Therefore, the content of the first antioxidant is applied within the above range. it is desirable

In one embodiment, the content of the pure acrylic resin may be applied in an amount of 15 to 25% by weight based on the total weight of the subject (ie, based on 100% by weight, which is the total weight of the subject). As a specific example, the content of the pure acrylic resin is 15% by weight, 16% by weight, 17% by weight, 18% by weight, 19% by weight, 20% by weight, 21% by weight, 22% by weight, 23% by weight, 24% by weight or 25% by weight may be provided. In addition, the content of the pure acrylic resin may be in the range of one or more of the above numerical values and one or less of the above numerical values.

For example, the content range of the pure acrylic resin is 15% to 20% by weight, 16% to 21% by weight, 17% to 22% by weight, 18% to 23% by weight, 19% to 24% by weight. , 20 wt% to 25 wt%, 21 wt% to 25 wt%, or 15 wt% to 25 wt% may be provided. The pure acrylic resin according to an embodiment may maintain the physical properties of the coating film at an excellent level within the above range.

If the pure acrylic resin is less than 15% by weight, the coating film adhesion may be deteriorated, and if it exceeds 25% by weight, the content of the silicone-modified (meth)acrylic polyol resin and the styrene-based acrylic resin is relatively reduced, resulting in a decrease in the coating film adhesion. Since overall physical properties may be deteriorated, it is preferable that the content of the pure acrylic resin is applied within the aforementioned range.

According to one embodiment, the pure acrylic resin is second propylene glycol monomethyl ether acetate, second methyl methacrylate, second butyl acrylate, second hydroxyethyl methacrylate, second acrylic acid, second organic peroxide and It can be prepared by polymerizing the second antioxidant.

In one embodiment, the content of the second propylene glycol monomethyl ether acetate may be applied at 30 to 40% by weight. As a specific example, the content of the second propylene glycol monomethyl ether acetate is 30% by weight, 31% by weight, 32% by weight, 33% by weight, 34% by weight, 35% by weight, 36% by weight, 37% by weight, 38% by weight , 39% by weight or 40% by weight may be provided. In addition, the content of the second propylene glycol monomethyl ether acetate may be within a range of one or more of the above values and one or less of the above values.

For example, the content range of the second propylene glycol monomethyl ether acetate is 30% to 35% by weight, 31% to 36% by weight, 32% to 37% by weight, 33% to 38% by weight, 34% by weight % to 39% by weight, 35% to 40% by weight or 30% to 40% by weight. The second propylene glycol monomethyl ether acetate according to one embodiment can maintain the physical properties of the coating film at an excellent level within the above range.

If the second propylene glycol monomethyl ether acetate is less than 30% by weight, the polymerization reaction is not smooth and the yield of the pure acrylic resin may decrease, and if it exceeds 40% by weight, the overall content of other components is relatively reduced. It is preferable that the content of the second propylene glycol monomethyl ether acetate is applied within the above-mentioned range because there is a concern that the physical properties of the coating film may be deteriorated.

In one embodiment, the content of the second methyl methacrylate may be applied at 20 to 30% by weight. As a specific example, the content of the second methyl methacrylate is 20% by weight, 21% by weight, 22% by weight, 23% by weight, 24% by weight, 25% by weight, 26% by weight, 27% by weight, 28% by weight, 29% by weight It may be provided at 30% by weight or 30% by weight. In addition, the content of the second methyl methacrylate may be in the range of one or more of the above values and one or less of the above values.

For example, the content range of the second methyl methacrylate is 20% to 25% by weight, 21% to 26% by weight, 22% to 27% by weight, 23% to 28% by weight, 24% to 24% by weight 29 wt%, 25 wt% to 30 wt%, or 20 wt% to 30 wt% may be provided. The second methyl methacrylate according to an embodiment may maintain the physical properties of the coating film at an excellent level within the above range.

If the content of the second methyl methacrylate is less than 20% by weight, the adhesiveness is lowered, and if it exceeds 30% by weight, the hardness of the coating film may decrease. Therefore, the content of the second methyl methacrylate is applied within the above range it is desirable to be

In one embodiment, the content of the second butyl acrylate (eg, n-butyl acrylate) may be applied at 20 to 30% by weight. As a specific example, the content of the second butyl acrylate is 20% by weight, 21% by weight, 22% by weight, 23% by weight, 24% by weight, 25% by weight, 26% by weight, 27% by weight, 28% by weight, 29% by weight % or 30% by weight. In addition, the content of the second butyl acrylate may be in the range of one or more of the above numerical values and one or less of the above numerical values.

For example, the content range of the second butyl acrylate is 20% to 25% by weight, 21% to 26% by weight, 22% to 27% by weight, 23% to 28% by weight, 24% to 29% by weight % by weight, 25% by weight to 30% by weight or 20% by weight to 30% by weight may be provided. The second butyl acrylate according to one embodiment can maintain the physical properties of the coating film at an excellent level within the above range.

If the content of 2nd butyl acrylate is less than 20% by weight, the viscosity of the paint increases and the coating workability decreases, and if it exceeds 30% by weight, the coating film adhesion or hardness may decrease, so the content of 2nd butyl acrylate is preferably applied within the aforementioned range.

In one embodiment, the content of the second hydroxyethyl methacrylate (eg, 2-hydroxyethyl methacrylate) may be applied at 10 to 20% by weight. As a specific example, the content of the second hydroxyethyl methacrylate is 10% by weight, 11% by weight, 12% by weight, 13% by weight, 14% by weight, 15% by weight, 16% by weight, 17% by weight, 18% by weight , 19% by weight or 20% by weight may be provided. In addition, the content of the second hydroxyethyl methacrylate may be in the range of one or more of the above values and one or less of the above values.

For example, the content range of the second hydroxyethyl methacrylate is 10% to 15% by weight, 11% to 16% by weight, 12% to 17% by weight, 13% to 18% by weight, 14% by weight % to 19 wt%, 15 wt% to 20 wt%, or 10 wt% to 20 wt% may be provided. The second hydroxyethyl methacrylate according to one embodiment can maintain the physical properties of the coating film at an excellent level within the above range.

If the second hydroxyethyl methacrylate is less than 10% by weight, the coating film adhesion is lowered, and if it exceeds 20% by weight, there is a concern that the coating film hardness is lowered. It is preferably applied within one range.

In one embodiment, the content of the second acrylic acid may be applied in an amount of 1 to 3% by weight. As a specific example, the content of the second acrylic acid may be provided as 1% by weight, 2% by weight or 3% by weight. In addition, the content of the second acrylic acid may be within a range of one or more of the above values and one or less of the above values.

For example, the content range of the second acrylic acid may be provided as 1 wt% to 2 wt%, 2 wt% to 3 wt%, or 1 wt% to 3 wt%. The second acrylic acid according to an embodiment can maintain the physical properties of the coating film at an excellent level within the above range.

If the content of the second acrylic acid is less than 1% by weight, the coating film adhesion may deteriorate, and if the content exceeds 3% by weight, weather resistance may deteriorate. Therefore, the content of the second acrylic acid is preferably applied within the above range.

In one embodiment, the content of the second organic peroxide (eg, benzoyl peroxide) may be applied in an amount of 0.1 to 1% by weight. As a specific example, the content of the second organic peroxide may be 0.1% by weight, 0.5% by weight or 1% by weight. In addition, the content of the second organic peroxide may range from one or more of the above values to less than one of the above values.

For example, the content range of the second organic peroxide may be 0.1 wt% to 0.5 wt%, 0.5 wt% to 1 wt%, or 0.1 wt% to 1 wt%. The second organic peroxide according to an embodiment may maintain the physical properties of a coating film at an excellent level within the above range.

If the amount of the second organic peroxide is less than 0.1% by weight, the degree of crosslinking of the polymer is too low, and if it exceeds 1% by weight, the degree of crosslinking is too high, which causes a problem of deterioration of physical properties of the coating film. Therefore, the content of the second organic peroxide is within the above range. It is preferable to apply in

In one embodiment, the content of the second antioxidant (eg, benzophenone) may be applied at 0.1 to 1% by weight. As a specific example, the content of the second antioxidant may be prepared as 0.1% by weight, 0.5% by weight or 1% by weight. In addition, the content of the second antioxidant may be in the range of one or more of the above values and one or less of the above values.

For example, the content range of the second antioxidant may be 0.1 wt% to 0.5 wt%, 0.5 wt% to 1 wt%, or 0.1 wt% to 1 wt%. The second antioxidant according to an embodiment may maintain the physical properties of the coating film at an excellent level within the above range.

If the amount of the second antioxidant is less than 0.1% by weight, the weatherability of the coating film may deteriorate, and if it exceeds 1% by weight, the overall properties of the coating film may be adversely affected. Therefore, the content of the second antioxidant is applied within the above range it is desirable

In one embodiment, the content of the styrene-based acrylic resin may be applied in an amount of 5 to 15% by weight based on the total weight of the subject (ie, based on 100% by weight, which is the total weight of the subject). As specific examples, the content of the styrene-based acrylic resin is 5% by weight, 6% by weight, 7% by weight, 8% by weight, 9% by weight, 10% by weight, 11% by weight, 12% by weight, 13% by weight, 14% by weight or 15% by weight. In addition, the content of the styrene-based acrylic resin may be in the range of one or more of the above numerical values and one or less of the above numerical values.

For example, the content range of the styrene-based acrylic resin is 5% to 10% by weight, 6% to 11% by weight, 7% to 12% by weight, 8% to 13% by weight, 9% to 14% by weight %, 10 wt% to 15 wt%, 11 wt% to 15 wt%, or 5 wt% to 15 wt% may be provided. The styrene-based acrylic resin according to one embodiment can maintain the physical properties of the coating film at an excellent level within the above range.

If the content of the styrene-based acrylic resin is less than 5% by weight, the coating film adhesion may be deteriorated, and if it exceeds 15% by weight, the content of the silicone-modified (meth)acrylic polyol resin and the pure acrylic resin is relatively reduced, thereby improving the quality of the coating film. Since overall physical properties may be deteriorated, the content of the styrene-based acrylic resin is preferably applied within the aforementioned range.

According to one embodiment, the styrenic acrylic resin is tertiary propylene glycol monomethyl ether acetate, styrene monomer, tertiary butyl acrylate, tertiary hydroxyethyl methacrylate, tertiary acrylic acid, epoxysilane, tertiary organic peroxide And it can be prepared by polymerizing the third antioxidant.

In one embodiment, the content of the third propylene glycol monomethyl ether acetate may be applied at 30 to 40% by weight. As a specific example, the content of the third propylene glycol monomethyl ether acetate is 30% by weight, 31% by weight, 32% by weight, 33% by weight, 34% by weight, 35% by weight, 36% by weight, 37% by weight, 38% by weight , 39% by weight or 40% by weight may be provided. In addition, the content of the third propylene glycol monomethyl ether acetate may be in the range of one or more of the above values and one or less of the above values.

For example, the content range of the third propylene glycol monomethyl ether acetate is 30% to 35% by weight, 31% to 36% by weight, 32% to 37% by weight, 33% to 38% by weight, 34% by weight % to 39% by weight, 35% to 40% by weight or 30% to 40% by weight. The third propylene glycol monomethyl ether acetate according to one embodiment can maintain the physical properties of the coating film at an excellent level within the above range.

If the third propylene glycol monomethyl ether acetate is less than 30% by weight, the polymerization reaction is not smooth and the yield of the styrene-based acrylic resin may decrease, and if it exceeds 40% by weight, the content of other components is relatively reduced. It is preferable that the content of the tertiary propylene glycol monomethyl ether acetate is applied within the above-mentioned range because there is a concern that the overall properties of the coating film may deteriorate.

In one embodiment, the content of the styrene monomer may be applied at 10 to 20% by weight. As a specific example, the content of the styrene monomer is 10% by weight, 11% by weight, 12% by weight, 13% by weight, 14% by weight, 15% by weight, 16% by weight, 17% by weight, 18% by weight, 19% by weight or It may be provided with 20% by weight. In addition, the content of the styrene monomer may be in a range of one or more of the above values and less than or equal to one of the above values.

For example, the content range of the styrene monomer is 10% to 15% by weight, 11% to 16% by weight, 12% to 17% by weight, 13% to 18% by weight, 14% to 19% by weight. , 15 wt% to 20 wt% or 10 wt% to 20 wt% may be provided. The styrene monomer according to one embodiment can maintain the physical properties of the coating film at an excellent level within the above range.

If the content of the styrene monomer is less than 10% by weight, the adhesion of the coating film may deteriorate, and if it exceeds 20% by weight, the weather resistance may deteriorate. Therefore, the content of the styrene monomer is preferably applied within the above-mentioned range. do.

In one embodiment, the content of tertiary butyl acrylate (eg, n-butyl acrylate) may be applied in an amount of 20 to 30% by weight. As a specific example, the content of tertiary butyl acrylate is 20% by weight, 21% by weight, 22% by weight, 23% by weight, 24% by weight, 25% by weight, 26% by weight, 27% by weight, 28% by weight, 29% by weight % or 30% by weight. In addition, the content of tertiary butyl acrylate may be in the range of one or more of the above numerical values and one or less of the above numerical values.

For example, the content range of tertiary butyl acrylate is 20% to 25% by weight, 21% to 26% by weight, 22% to 27% by weight, 23% to 28% by weight, 24% to 29% by weight % by weight, 25% by weight to 30% by weight or 20% by weight to 30% by weight may be provided. Tertiary butyl acrylate according to an embodiment can maintain the physical properties of the coating film at an excellent level within the above range.

If the amount of tertiary butyl acrylate is less than 20% by weight, the viscosity of the paint increases and the coating workability decreases, and if it exceeds 30% by weight, the coating film adhesion or hardness may decrease, so the content of tertiary butyl acrylate is preferably applied within the aforementioned range.

In one embodiment, the content of the third hydroxyethyl methacrylate (eg, 2-hydroxyethyl methacrylate) may be applied in an amount of 10 to 20% by weight. As a specific example, the content of the third hydroxyethyl methacrylate is 10% by weight, 11% by weight, 12% by weight, 13% by weight, 14% by weight, 15% by weight, 16% by weight, 17% by weight, 18% by weight , 19% by weight or 20% by weight may be provided. In addition, the content of the third hydroxyethyl methacrylate may be in the range of one or more of the above values and one or less of the above values.

For example, the content range of the third hydroxyethyl methacrylate is 10% to 15% by weight, 11% to 16% by weight, 12% to 17% by weight, 13% to 18% by weight, 14% by weight % to 19 wt%, 15 wt% to 20 wt%, or 10 wt% to 20 wt% may be provided. The third hydroxyethyl methacrylate according to one embodiment can maintain the physical properties of the coating film at an excellent level within the above range.

If the third hydroxyethyl methacrylate is less than 10% by weight, the coating film adhesion is lowered, and if it exceeds 20% by weight, there is a concern that the coating film hardness is lowered. It is preferably applied within one range.

In one embodiment, the content of the third acrylic acid may be applied at 10 to 15% by weight. As a specific example, the content of the third acrylic acid may be prepared as 10% by weight, 11% by weight, 12% by weight, 13% by weight, 14% by weight or 15% by weight. In addition, the content of the third acrylic acid may be in a range of one or more of the above values and one or less of the above values.

For example, the content range of the third acrylic acid may be provided as 10 wt% to 13 wt%, 12 wt% to 15 wt%, or 10 wt% to 15 wt%. The third acrylic acid according to one embodiment can maintain the physical properties of the coating film at an excellent level within the above range.

If the amount of the tertiary acrylic acid is less than 10% by weight or greater than 15% by weight, it may negatively affect the coating film adhesion or weather resistance, so the content of the tertiary acrylic acid is preferably applied within the above range.

In one embodiment, the content of epoxysilane (eg, 3-glycidoxytrimethoxysilane) may be applied at 5 to 10% by weight. As a specific example, the content of epoxysilane may be 5% by weight, 6% by weight, 7% by weight, 8% by weight, 9% by weight or 10% by weight. In addition, the content of epoxysilane may be in a range of one or more of the above numerical values and less than one of the above numerical values.

For example, the content range of epoxysilane may be provided as 5 wt% to 7 wt%, 6 wt% to 8 wt%, or 5 wt% to 10 wt%. Epoxysilane according to one embodiment can maintain the physical properties of the coating film at an excellent level within the above range.

If the amount of epoxysilane for the preparation of the styrene-based acrylic resin is less than 5% by weight, the adhesion of the coating film may deteriorate, and if it exceeds 10% by weight, there is a concern that the overall physical properties of the coating film may have a negative effect. It is preferably applied within one range.

In one embodiment, the amount of the third organic peroxide (eg, benzoyl peroxide) may be 0.1 to 1% by weight. As a specific example, the content of the third organic peroxide may be 0.1% by weight, 0.5% by weight or 1% by weight. In addition, the content of the third organic peroxide may range from one or more of the above values to less than one of the above values.

For example, the content range of the third organic peroxide may be 0.1 wt% to 0.5 wt%, 0.5 wt% to 1 wt%, or 0.1 wt% to 1 wt%. The third organic peroxide according to an embodiment can maintain the physical properties of a coating film at an excellent level within the above range.

If the third organic peroxide is less than 0.1% by weight, the degree of crosslinking of the polymer is too low, and if it exceeds 1% by weight, the degree of crosslinking is too high, which causes a problem of deterioration in physical properties of the coating film. Therefore, the content of the third organic peroxide is within the above range. It is preferable to apply in

In one embodiment, the content of the third antioxidant (eg, benzophenone) may be applied at 0.1 to 1% by weight. As a specific example, the content of the third antioxidant may be prepared as 0.1% by weight, 0.5% by weight or 1% by weight. In addition, the content of the third antioxidant may be in the range of one or more of the above values and one or less of the above values.

For example, the content range of the third antioxidant may be 0.1 wt% to 0.5 wt%, 0.5 wt% to 1 wt%, or 0.1 wt% to 1 wt%. The third antioxidant according to an embodiment can maintain the physical properties of the coating film at an excellent level within the above range.

If the amount of the third antioxidant is less than 0.1% by weight, weather resistance of the coating film may be reduced, and if it exceeds 1% by weight, the overall properties of the coating film may be adversely affected. Therefore, the content of the third antioxidant is applied within the above range. it is desirable

Meanwhile, in one embodiment, based on the total weight of the subject (that is, based on 100% by weight, which is the total weight of the subject), the dispersant for the subject may be applied in an amount of 0.1 to 1% by weight, and the thickener for the subject may be applied in an amount of 0.1 to 4% by weight. The theme color pigment may be applied in an amount of 1 to 20% by weight, the extender pigment for a theme may be applied in an amount of 1 to 10% by weight, and the subject diluent may be applied in an amount of 1 to 5% by weight. The antifoaming agent may be applied in an amount of 0.1 to 1% by weight.

In one embodiment, the curing agent may include aliphatic polyisocyanate and a diluent. According to one embodiment, aliphatic polyisocyanate may be provided with an NCO% of 19 to 25% by weight of non-yellowing type isocyanate, and aliphatic polyisocyanate is a commercially available product (eg, Covestro's Desmodur N 3300) can be used. In addition, the content of aliphatic polyisocyanate may be applied in an amount of 75 to 85% by weight based on the total weight of the curing agent (ie, based on 100% by weight, which is the total weight of the curing agent).

As specific examples, the content of aliphatic polyisocyanate is 75 wt%, 76 wt%, 77 wt%, 78 wt%, 79 wt%, 80 wt%, 81 wt%, 82 wt%, 83 wt%, 84 wt% or 85% by weight. Further, the content of aliphatic polyisocyanate may range from one or more of the above numerical values to less than one of the above numerical values.

For example, the content range of aliphatic polyisocyanate may be 75 wt% to 80 wt%, 76 wt% to 83 wt%, 77 wt% to 84 wt%, or 75 wt% to 85 wt%. Aliphatic polyisocyanate according to an embodiment can maintain the physical properties of a coating film at an excellent level within the above range.

If the content of aliphatic polyisocyanate is less than 75% by weight, the curing reaction is not smooth, and if it exceeds 85% by weight, the overall physical properties of the coating film may be adversely affected due to unreacted substances. It is preferable to apply within

According to one embodiment, a commercially available product (eg, Daelim's n-butyl acetate) may be used as the diluent. In one embodiment, the content of the diluent may be applied in an amount of 15 to 25% by weight based on the total weight of the curing agent (ie, based on 100% by weight, which is the total weight of the curing agent). As specific examples, the content of the diluent is 15% by weight, 16% by weight, 17% by weight, 18% by weight, 19% by weight, 20% by weight, 21% by weight, 22% by weight, 23% by weight, 24% by weight or 25% by weight. % can be provided. In addition, the amount of the diluent may be in a range of one or more of the above values and less than or equal to one of the above values.

For example, the content range of the diluent may be 15 wt% to 20 wt%, 16 wt% to 23 wt%, 17 wt% to 24 wt%, or 15 wt% to 25 wt%. The diluent according to one embodiment may maintain the physical properties of the coating film at an excellent level within the above range.

If the diluent is less than 15% by weight or more than 25% by weight, the curing reaction is not smooth, which may negatively affect the overall properties of the coating film.

<Description of the concrete coating method using the paint composition>

Hereinafter, a concrete painting method according to an embodiment of the present invention will be described with reference to FIG. 1, but will be described in order for convenience.

1. Preprocessing step <S101>

In this step, a pretreatment process of removing at least one of a foreign substance and an old coating film present in the area to be painted may be performed. For example, in this step, water may be sprayed at a constant temperature and pressure to remove an excited old coating film existing in an area to be painted and to remove dust and chalking substances on the surface of the old coating film. Here, the old coating film means a coating film that has been coated in advance.

2. Formation of the first coating layer <S102>

In this step, the first composition according to one embodiment may be coated on the surface of the concrete to form a first coating layer. For example, in this step, the first composition may be coated twice to a certain thickness to form a first coating layer on one surface of the concrete.

3. Maintenance step <S103>

At this stage, cracks in the concrete surface can be repaired. For example, in this step, putty may be applied to the crack and filled.

4. Second coating layer formation step <S104>

In this step, the second composition may be coated on the first coating layer to form a second coating layer.

Hereinafter, the present invention will be described in more detail through specific examples and experimental examples. Since the following examples and experimental examples are only examples for helping understanding of the present invention, the scope of the present invention is not limited or limited thereto.

1. Preparation of the first composition

Add acrylic emulsion (1), silicone resin emulsion (2), dispersing agent (3), fluidizing agent (4), antifoaming agent (5), film forming aid (6) and water (7) to the first agitator and stir at 100 to 200 rpm The emulsion composition was prepared by mixing for 30 minutes. Meanwhile, a powder composition was prepared by putting cement (8) and quicklime (9) into the second stirring container and mixing them at 100 to 200 rpm for 30 minutes. When preparing the powder composition, cement having a powder degree of 6000 cm 2 /g was used. Thereafter, the prepared powder composition was poured into a first stirring cylinder, stirred at 600 rpm for 3 to 5 minutes, and sufficiently mixed, but the emulsion composition and the powder composition were mixed by setting a weight ratio of 9:10, and the preparation of the first composition was completed. The content of each component was applied as the content (unit: g) described in Table 1.

division Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 1) Acrylic emulsion 70 80 90 85 65 95 2) silicone resin emulsion 15 10 5 10 20 0 3) Dispersant 0.5 0.5 0.5 0.5 0.5 0.5 4) fluidizing agent 0.2 0.2 0.2 0.2 0.2 0.2 5) Defoamer 0.5 0.5 0.5 0.5 0.5 0.5 6) Formulation 0.5 0.5 0.5 0.6 0.5 0.5 7) water 13.3 8.3 3.3 3.2 13.3 3.3 8) Cement 85 90 95 95 80 100 9) quicklime 15 10 5 5 20 0 1): Acrylic emulsion with glass transition temperature of 10℃ (DOW)
2): Silicone resin emulsion (Wacker Co.)
3): Sodium-based dispersant (BASF)
4): fluidizing agent (Solvay)
5): Silica-containing silicone defoamer (Evonik)
6): Film preparation (EASTMAN)
7) : tap water
8) : Cement (Ssangyong Yang Company)
9): Quicklime (Taekyung B.K.)

2. Evaluation of physical properties of the first composition

The physical properties of each prepared Example and Comparative Example were measured by the following method, and the results are shown in Table 2 below.

[Test method]

1. Drying time: After painting on a glass plate with a thickness of 100㎛ in a constant temperature (20 ℃) space, check the solidification and drying (the time when fingerprints do not appear when gently wiping with a cloth after pressing with force with your thumb and forefinger) recorded).

2. Adhesion: After applying 5 mil each on concrete, mortar surface, and first-class coating film for water-based exterior walls, the formed coating film is cut into 100 checkerboard-shaped slices with a size of 1 mm * 1 mm, and glass tape is attached on the slices. , Adhesion was evaluated by measuring the number of fragments attached to the substrate without falling off when peeled off. Adhesion is evaluated as good if 100 fragments are all attached, good adhesion if 98 to 99 fragments are attached, and adhesion is evaluated as poor if the number of fragments attached to the substrate is 97 or less.

3. Water resistance: After forming a coating film with a thickness of 100㎛ on a slate plate, immersing it in water to check whether or not an abnormality such as peeling or discoloration of the coating film occurs. .

4. Storage stability: After leaving the container containing the prepared paint composition in a constant temperature water bath at 60 ° C for 30 days, if the viscosity of the composition has increased by more than 2 times compared to before the test or phase separation has occurred, the storage property is poor and the viscosity change is 2 If it is less than twice and phase separation does not occur, it is evaluated as good.

5. Adhesion: When the paint composition is coated on the concrete surface with a roller to a thickness of 100㎛ during the hot season, and after 24 hours have elapsed, when the concrete temperature reaches about 50 ° C at around 3:00 pm, the degree of stickiness of the coating film is checked by hand, If the coating film is softened and stickiness occurs, the adhesiveness is evaluated as poor, and if it is not sticky, it is evaluated as good.

6. Smell: Open the lid of the container containing the paint composition, and check whether there is a sour or other disgusting smell from the paint while blowing the wind with your hand in front of your nose toward your nose.

7. Hardness: After coating the coating composition to a thickness of 100 μm on the test steel sheet, a 45° inclination and a load of 750 g were applied using a Mitsubishi pencil to evaluate the abnormality of the coating film of the test steel sheet when moving 2 cm. In the case of 5 evaluations, the maximum pencil hardness value was recorded when there were no scratches in all 5 times.

8. Appearance: After coating the paint composition to a thickness of 100㎛ on the concrete surface, drying at 15 ℃ for 1 day, the degree of smoothness of the painted surface is evaluated. That is, when the surface of the painted surface is touched with a hand, the degree to which the presence of surface irregularities can be felt is evaluated. If the surface irregularities can be clearly felt by touch, the appearance is poor, and if the surface smoothness is excellent, it is considered good. evaluated.

9. Miscibility: If the mixture of the emulsion composition and the powder composition is visually checked and it is confirmed that the aggregation does not occur and the agitation is smoothly performed, the miscibility is good, and if even a little aggregation occurs, it is good (-), if the agglomeration is severe, the miscibility is evaluated as poor.

10. Adhesion strength: After forming a painted surface with a thickness of 100㎛ on l00mmX100mm concrete and drying it at room temperature for 7 days, the adhesion strength (unit: MPa) of the painted surface formed by each composition is measured using a UTM (Universal Testing Machine). box.

Experiment item Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 drying time 4.5 hours 5 hours 5 hours 5 hours 4 hours 5 hours Adhesion (concrete/mortar surface/aqueous old coating) good/good/good good/good/good good/good/good good/good/good Good(-)/Good(-)/Bad good/good/good water resistance Good Good Good Good Good Good Zhejiang Good Good Good Good error Good stickiness Good Good Good Good Good Good smell Good Good Good Good Good Good Hardness H H H H F F Exterior Good Good Good Good Good Good Miscibility Good Good Good Good Good(-) Good(-) adhesion strength 2.5 2.7 3.0 3.7 1.5 2.8

As shown in Table 2, Examples 1 to 4 of the present invention are generally excellent in physical properties such as drying time, adhesion, water resistance, storability, adhesiveness, odor, hardness, appearance, miscibility and adhesion strength of the coating film. On the other hand, through the experimental results of Comparative Examples 1 and 2, it can be seen that when the content of each component included in the paint composition exceeds or is less than the input amount range for each component, the physical properties are deteriorated.

3. Additional manufacturing and physical property evaluation of the first composition

When mixing the emulsion composition and the powder composition, the coating composition was prepared by setting the same settings as in Example 2, except that the weight ratio was applied to the numerical value shown in Table 3 below, and the physical properties by the above-described miscibility, hardness, and adhesion strength evaluation method was evaluated and the results are listed in Table 3.

Experiment item Example 5 Example 6 Example 7 Comparative Example 3 Comparative Example 4 Comparative Example 5 Weight ratio when mixing (emulsion composition: powder composition) 9:9 9:10 9:11 9:8 9:12 9:13 Hardness H H H F H 2H Miscibility Good Good Good Good Good Good adhesion strength 3.6 3.7 3.7 2.8 2.9 3.1

As shown in Table 3, Examples 5 to 7 of the present invention have generally excellent physical properties such as hardness, miscibility, and adhesion strength of the coating film, whereas in Comparative Examples 3 to 5, the physical properties are relatively deteriorated. can confirm what happened.

4. Additional manufacturing and physical property evaluation of the first composition

A test piece and a base plate were prepared by the method described in Table 4 below, and the coating film properties for each item of the coating composition according to Example 4 were evaluated based on the KS F 4936 (concrete protective coating agent) physical property test method, and the results are as follows It is listed in Table 5.

item Dimensions of test piece mm Count Appearance after film formation 100×100 test piece a 3 per item neutralization depth measurement 100×100×100 Mortarb 3 Chloride ion permeation resistance test 100×50 mortar 5 moisture permeability test 150 test pieces 3 Water permeability test 150×40 mortar board 3 adhesion strength test 70×70×20 mortar board b 3 per item Crack response test 230×90×6 flexible board c 3 per item a: The mold has a smooth surface without warpage and has been treated so that it can be easily demolded after molding the coating film.
b: Mortar mixed by the method specified in 7.3.1 of KS F 2476 is molded using a metal or synthetic resin mold suitable for each dimension and cured for 48 hours at a temperature of 20±2°C and a relative humidity of 90% or higher. After demolding, curing in water at 20±2℃ for 5 days, curing at 65±20% relative humidity and 20±2℃ for more than 7 days. After that, use the No. 150 abrasive paper specified in KS L 6003 to grind the bottom surface when the mortar is compacted, and use the cleaned bottom plate for testing.
c: Use the flexible board specified in KS L 5114 as the base plate for testing.

As shown in Table 5, the first composition according to Example 4 of the present invention evaluated the appearance after forming the coating film, and as a result, wrinkles, fine cracks, pinholes, deformation and peeling did not occur in the coating film, and the appearance of the coating film was excellent. , it can be confirmed that it is effective in preventing neutralization of concrete. In addition, the first composition according to Example 4 has excellent chloride ion permeation resistance, moisture permeability, and water permeability resistance, satisfies the standards for adhesion strength in various environments, and does not crack or break when evaluating crack response according to temperature. It can be confirmed that it has excellent durability.

5. Preparation of silicone-modified (meth)acrylic polyol resin

70 parts by weight of xylene and 60 parts by weight of toluene were added to a 500ml four-necked flask, and 36 parts by weight of first propylene glycol monomethyl ether acetate, 1 part by weight of one-end silicone, 20 parts by weight of first methyl methacrylate, 20 parts by weight of first methyl methacrylate, Injecting 20 parts by weight of 1 butyl acrylate, 20 parts by weight of 1st hydroxyethyl methacrylate, 1 part by weight of 1st acrylic acid, 1 part by weight of 1st organic peroxide and 1 part by weight of 1st antioxidant, polymerization initiator (2, 1.5 parts by weight of 2-azobisisobutyronitrile) was uniformly dropped at 80° C. for 120 minutes, and the aging reaction was performed at the same temperature for 120 minutes. The termination point of the reaction was determined by measuring the solid content, and the reaction was terminated at 97% by weight or more of the non-volatile content, and 50 parts by weight of xylene was added at the end of the reaction to obtain a silicone-modified (meth)acrylic polyol resin.

6. Preparation of pure acrylic polyol resin

70 parts by weight of xylene and 60 parts by weight of toluene were added to a 500ml four-necked flask, and 37 parts by weight of propylene glycol monomethyl ether acetate, 20 parts by weight of methyl methacrylate, and 20 parts by weight of butyl acrylate were added under a nitrogen stream. 20 parts by weight of the second hydroxyethyl methacrylate, 1 part by weight of the second acrylic acid, 1 part by weight of the second organic peroxide, and 1 part by weight of the second antioxidant were injected, and a polymerization initiator (2,2-azobisisobutyro Nitrile) 1.5 parts by weight was uniformly dropped at 80 ° C. for 120 minutes, and the aging reaction was performed at the same temperature for 120 minutes. The completion point of the reaction was determined by measuring the solid content, and the reaction was terminated at 97% by weight or more of the non-volatile matter, and at the end of the reaction, 50 parts by weight of xylene was added to obtain a pure acrylic resin.

7. Preparation of styrene-based acrylic polyol resin

70 parts by weight of xylene and 60 parts by weight of toluene were added to a 500 ml four-necked flask, and 33 parts by weight of tertiary propylene glycol monomethyl ether acetate, 10 parts by weight of styrene monomer, 20 parts by weight of tertiary butyl acrylate, 3 parts by weight of tertiary butyl acrylate were added under a nitrogen stream 20 parts by weight of hydroxyethyl methacrylate, 10 parts by weight of tertiary acrylic acid, 5 parts by weight of epoxysilane, 1 part by weight of tertiary organic peroxide and 1 part by weight of tertiary antioxidant were injected, and a polymerization initiator (2,2-azobis 1.5 parts by weight of isobutyronitrile) was uniformly dropped at 80° C. for 120 minutes, and a maturation reaction was performed at the same temperature for 120 minutes. The completion point of the reaction was determined by measuring the solid content, and the reaction was terminated at 97% by weight or more of the non-volatile content, and 50 parts by weight of xylene was added at the end of the reaction to obtain a styrene-based acrylic resin.

8. Preparation of the second composition

Silicone-modified (meth)acrylic polyol resin (1), pure acrylic resin (2), styrene-based acrylic resin (3), main dispersant (4), main thickener 1 (5), main colorant Pigment (7), extender pigment 1 (8), extender pigment 2 (9), and antifoamer (11) were added, mixed at 1000-1500 rpm for 30 minutes, and thickener 2 (6) and A diluent (10) was added and stirred at 700 to 1000 rpm for 20 minutes to prepare a subject. Then, a diluent for a curing agent and aliphatic polyisocyanate were added to the second stirring container and stirred at 700 to 1000 rpm for 20 minutes to prepare a curing agent. A second composition was prepared by mixing the prepared subject and the curing agent in a weight ratio of 6.8:1. The content of each component was applied as the content (unit: grams) described in Table 6.

division Example 8 Example 9 Example 10 Comparative Example 6 Comparative Example 7 subject 1) Silicone-modified (meth)acrylic polyol resin 45 50 55 40 60 2) Pure acrylic resin 20 15 15 20 5 3) Styrene-based acrylic resin 5 5 5 10 5 4) Dispersant for subject 0.5 0.5 0.5 0.5 0.5 5) Thickener for subject 1 One One 0.2 One One 6) Thickener 2 for subject One One 0.3 One One 7) Color pigment for subject 17 17 16 17 17 8) Extender Pigment for Subject 1 6 6 5.5 6 6 9) Extender pigment for the subject 2 One One 0.5 One One 10) Diluent for subject 3 3 1.5 3 3 11) Antifoaming agent for the subject 0.5 0.5 0.5 0.5 0.5 curing agent 12) Diluent for curing agent 19 19 19 19 19 13) Aliphatic polyisocyanate 81 81 81 81 81 1): Silicone-modified (meth)acrylic polyol resin prepared by the above method (Jogwang Paint Co.)
2): Pure acrylic resin prepared by the above method (Jogwang Paint Co.)
3): Styrene-based acrylic resin prepared by the above method (Jogwang Paint Co.)
4): Low molecular weight unsaturated polycarboxylic acid polymer (BYK)
5): Bentonite (HS Chem)
6) : Amide Wax (Heungsanseongsa)
7): Titanium dioxide (Crystal)
8): Talc-based extender pigment (Dawon Chemical Co.)
9): Silicon oxide (Grace)
10): Propylene glycol monomethyl ether acetate (Dausa)
11): Polysiloxane defoamer (BYK)
12) : n-butyl acetate (Daelim)
13): Aliphatic polyisocyanate (Covestro)

9. Evaluation of physical properties of composition 2

The physical properties of the second composition according to prepared Examples 8 to 10 and Comparative Examples 6 to 7 were measured by the following method, and the results are shown in Table 7.

1) Viscosity: Measured with a stormer viscometer by adjusting the temperature of the paint to 25℃.

2) Specific Gravity: Measure the weight by pouring the paint into a cup of specific gravity specified by adjusting the temperature of the paint to 25℃.

3) Drying time: After coating on the glass plate in a constant temperature (20 ℃) space, check the solidification and drying (record the time when fingerprints do not appear when gently wiped with a cloth after pressing with force with your thumb and index finger).

4) Adhesion with the undercoat: After coating the second composition at 5 mil on the undercoat film formed by the first composition according to Example 4 and drying it, a dolly was attached to the film and a dolly test was performed to separate the layers Measure the maximum pressure when

5) Weatherability: After taking the initial Y value (yellowness level) through a computerized colorimeter, pass it through 30 times using a UV irradiator under the conditions of 2 lamps, 160W lamp intensity, and 10rpm line speed, and Y through a computerized colorimeter The difference from the initial Y value was calculated by taking the value, and the smaller the difference value, the better the weatherability.

6) Contamination resistance (easy to clean): Coat the second composition on a substrate at 5 mil to form a coating film, drop a carbon black sample on the formed coating film, wipe it off with water, visually check the remaining level, When 100% of the contamination is removed, the contamination resistance is excellent, when the contaminated marks are removed by 90% or more, the contamination resistance is good, and when the contamination is removed by more than 50% to less than 90%, the contamination resistance is evaluated as normal. box.

7) Storage stability: After the container containing the manufactured subject was left in a constant temperature water bath at 60 ° C, it was visually observed at regular intervals and the time immediately before the phase separation phenomenon occurred was recorded.

Experiment item Example 8 Example 9 Example 10 Comparative Example 6 Comparative Example 7 Viscosity (KU) 122 120 120 118 117 importance 1.28 1.28 1.26 1.28 1.28 drying time 3.5 hours 3.5 hours 3.5 hours 3.5 hours 3.5 hours Adhesion to the sewer 785psi 780psi 780psi 780psi 740psi weatherability 0.7 0.5 0.4 1.0 0.3 stain resistance Good Great Great commonly Great Zhejiang 6 months 6 months 6 months 6 months 6 months

As shown in Table 7, Examples 8 to 10 of the present invention have generally excellent physical properties such as adhesion to the undercoat, weather resistance, and stain resistance, while comparative examples 6 to 7 have relatively low physical properties. can confirm what happened.

10. Additional preparation of the second composition

Silicone-modified (meth)acrylic polyol resin (1), pure acrylic resin (2), styrene-based acrylic resin (3), main dispersant (4), main thickener 1 (5), main colorant Pigment (7), extender pigment 1 (8), extender pigment 2 (9), and antifoamer (11) were added, mixed at 1000-1500 rpm for 30 minutes, and thickener 2 (6) and A diluent (10) was added and stirred at 700 to 1000 rpm for 20 minutes to prepare a subject. Then, a diluent for a curing agent and aliphatic polyisocyanate were added to the second stirring container and stirred at 700 to 1000 rpm for 20 minutes to prepare a curing agent. A second composition was prepared by mixing the prepared subject and the curing agent in a weight ratio of 6.8:1. The content of each component was applied as the content (unit: grams) described in Table 8.

division Example 11 Example 12 Example 13 Comparative Example 8 Comparative Example 9 subject 1) Silicone-modified (meth)acrylic polyol resin 50 45 45 50 45 2) Pure acrylic resin 15 20 25 10 30 3) Styrene-based acrylic resin 5 5 5 10 5 4) Dispersant for subject 0.5 0.5 0.5 0.5 0 5) Thickener for subject 1 One One 0.2 One 0 6) Thickener 2 for subject One One 0.3 One 0 7) Color pigment for subject 17 17 16 17 16 8) Extender Pigment for Subject 1 6 6 5.5 6 4 9) Extender pigment for the subject 2 One One 0.5 One 0 10) Diluent for subject 3 3 1.5 3 0 11) Antifoaming agent for the subject 0.5 0.5 0.5 0.5 0 curing agent 12) Diluent for curing agent 19 19 19 19 19 13) Aliphatic polyisocyanate 81 81 81 81 81 1): Silicone-modified (meth)acrylic polyol resin prepared by the above method (Jogwang Paint Co.)
2): Pure acrylic resin prepared by the above method (Jogwang Paint Co.)
3): Styrene-based acrylic resin prepared by the above method (Jogwang Paint Co.)
4): Low molecular weight unsaturated polycarboxylic acid polymer (BYK)
5): Bentonite (HS Chem)
6) : Amide Wax (Heungsanseongsa)
7): Titanium dioxide (Crystal)
8): Talc-based extender pigment (Dawon Chemical Co.)
9): Silicon oxide (Grace)
10): Propylene glycol monomethyl ether acetate (Dausa)
11): Polysiloxane defoamer (BYK)
12) : n-butyl acetate (Daelim)
13): Aliphatic polyisocyanate (Covestro)

11. Evaluation of physical properties of the second composition

The physical properties of the second compositions according to prepared Examples 11 to 13 and Comparative Examples 8 to 9 were measured in the same manner as in the above evaluation method, and the results are shown in Table 9.

Experiment item Example 11 Example 12 Example 13 Comparative Example 8 Comparative Example 9 Viscosity (KU) 120 122 120 123 118 importance 1.28 1.28 1.26 1.28 1.24 drying time 3.5 3.5 3.5 3.5 4.0 Adhesion to the sewer 780 785 785 770 780 weatherability 0.5 0.7 0.7 0.85 0.75 stain resistance Great Good Good commonly commonly Zhejiang 6 months 6 months 6 months 6 months 6 months

As shown in Table 9, Examples 11 to 13 of the present invention have generally excellent physical properties such as adhesion to the undercoat, weather resistance, and stain resistance, whereas Comparative Examples 8 to 9 have relatively low physical properties can confirm what happened.

12. Additional Preparation of Composition 2

Silicone-modified (meth)acrylic polyol resin (1), pure acrylic resin (2), styrene-based acrylic resin (3), main dispersant (4), main thickener 1 (5), main colorant Pigment (7), extender pigment 1 (8), extender pigment 2 (9), and antifoamer (11) were added and mixed for 30 minutes at 1000-1500 rpm, followed by thickener 2 (6) and A diluent (10) was added and stirred at 700 to 1000 rpm for 20 minutes to prepare a subject. In addition, a diluent for a curing agent and aliphatic polyisocyanate were added to the second stirring container and stirred at 700 to 1000 rpm for 20 minutes to prepare a curing agent. A second composition was prepared by mixing the prepared subject and the curing agent in a weight ratio of 6.8:1. The content of each component was applied as the content (unit: grams) described in Table 10.

division Example 14 Example 15 Example 16 Comparative Example 10 Comparative Example 11 subject 1) Silicone-modified (meth)acrylic polyol resin 50 45 45 45 45 2) Pure acrylic resin 15 15 15 25 15 3) Styrene-based acrylic resin 5 10 15 0 20 4) Dispersant for subject 0.5 0.5 0.5 0.5 0 5) Thickener for subject 1 One One 0.2 One 0 6) Thickener 2 for subject One One 0.3 One 0 7) Color pigment for subject 17 17 16 17 15 8) Extender Pigment for Subject 1 6 6 5.5 6 5 9) Extender Pigment for Subject 2 One One 0.5 One 0 10) Diluent for subject 3 3 1.5 3 0 11) Antifoaming agent for the subject 0.5 0.5 0.5 0.5 0 curing agent 12) Diluent for curing agent 19 19 19 19 19 13) Aliphatic polyisocyanate 81 81 81 81 81 1): Silicone-modified (meth)acrylic polyol resin prepared by the above method (Jogwang Paint Co.)
2): Pure acrylic resin prepared by the above method (Jogwang Paint Co.)
3): Styrene-based acrylic resin prepared by the above method (Jogwang Paint Co.)
4): Low molecular weight unsaturated polycarboxylic acid polymer (BYK)
5): Bentonite (HS Chem)
6) : Amide Wax (Heungsanseongsa)
7): Titanium dioxide (Crystal)
8): Talc-based extender pigment (Dawon Chemical Co.)
9): Silicon oxide (Grace)
10): Propylene glycol monomethyl ether acetate (Dausa)
11): Polysiloxane defoamer (BYK)
12) : n-butyl acetate (Daelim)
13): Aliphatic polyisocyanate (Covestro)

13. Evaluation of physical properties of the second composition

The physical properties of the second compositions according to Examples 14 to 16 and Comparative Examples 10 to 11 were measured in the same manner as in the above evaluation method, and the results are shown in Table 11.

Experiment item Example 14 Example 15 Example 16 Comparative Example 10 Comparative Example 11 Viscosity (KU) 120 123 120 123 118 importance 1.28 1.28 1.26 1.28 1.24 drying time 3.5 hours 3.5 hours 3.5 hours 4 hours 3 hours Adhesion to the sewer 770psi 775psi 780psi 750psi 750psi weatherability 0.5 0.65 0.8 0.6 1.5 stain resistance Great Good commonly commonly commonly Zhejiang 6 months 6 months 6 months 6 months 6 months

As shown in Table 11, Examples 14 to 16 of the present invention have generally excellent physical properties such as adhesion to the undercoat, weather resistance, and stain resistance, whereas Comparative Examples 10 to 11 have relatively low physical properties can confirm what happened.

As described above, according to various embodiments of the present invention, an acrylic emulsion and a modified polysiloxane resin emulsion having excellent water resistance and adhesion are used as main raw materials to minimize water absorption in a small amount of capillary and improve adhesion and durability (matrix reinforcement) ) and form a neutralization prevention layer from the concrete matrix, and can prevent corrosion of reinforcing bars due to its excellent flame resistance.

In addition, according to various embodiments of the present invention, the appearance of the structure can be maintained for a long time by improving the adhesiveness, durability, weather resistance, etc. Therefore, it is possible to achieve long life of concrete structures.

In addition, the coating composition according to various embodiments of the present invention has excellent physical properties by being composed of organic and inorganic composite types and reacting, and penetrates into the concrete matrix after coating the coating composition to improve tensile strength, compressive strength, acid resistance, alkali resistance, etc. of concrete. It can prevent neutralization of concrete for a certain period of time even if it is damaged by impact by improving physical and chemical properties.

In addition, according to various embodiments of the present invention, the second composition having UV blocking performance is applied to the outer surface of the concrete structure, which is the object, to form a second coating layer, and performance such as UV blocking, weather resistance, stain resistance, etc. By improving adhesion, it is possible to achieve long life of concrete structures.

In addition, according to various embodiments of the present invention, the second coating layer has excellent adhesion to the first coating layer, and excellent weather resistance and stain resistance, so that it can be self-cleaned with a small amount of water, and the oil stain on the coating film is almost eliminated. It is not attached and can contribute to extending the life of concrete structures.

As described above, the detailed description of the present invention has been made by examples, but since the above-described embodiments have only been described by way of preferred examples of the present invention, it should not be understood that the present invention is limited only to the above embodiments. No, the scope of the present invention should be understood as the following claims and their equivalent concepts.

Claims (7)

A first composition prepared to form a first coating layer on concrete; and
A second composition prepared to form a second coating layer on the first coating layer;
The first composition includes an emulsion composition and a powder composition,
The second composition is
subjects including silicone-modified (meth)acrylic polyol resins, pure acrylic resins, and styrene-based acrylic resins; and
A curing agent comprising aliphatic polyisocyanate and a diluent;
The silicone-modified (meth)acrylic polyol resin is
30 to 40% by weight of first propylene glycol monomethyl ether acetate;
0.5 to 2% by weight of single-ended silicon;
20 to 30% by weight of primary methyl methacrylate;
20 to 30% by weight of 1st butyl acrylate;
10 to 20% by weight of first hydroxyethyl methacrylate;
1 to 3% by weight of the first acrylic acid;
0.1 to 1% by weight of the first organic peroxide; and
0.1 to 1% by weight of the first antioxidant;
The pure acrylic resin is
Second propylene glycol monomethyl ether acetate 30 to 40% by weight;
20 to 30% by weight of the second methyl methacrylate;
20-30% by weight of 2nd butyl acrylate;
10 to 20% by weight of the second hydroxyethyl methacrylate;
1 to 3% by weight of the second acrylic acid;
0.1 to 1% by weight of the second organic peroxide; and
0.1 to 1% by weight of the second antioxidant;
The styrene-based acrylic resin is
30 to 40% by weight of tertiary propylene glycol monomethyl ether acetate;
10 to 20% by weight of styrene monomer;
20 to 30% by weight of tertiary butyl acrylate;
10 to 20% by weight of third hydroxyethyl methacrylate;
10 to 15% by weight of the third acrylic acid;
5 to 10% by weight of epoxysilane;
0.1 to 1% by weight of the third organic peroxide; and
Characterized in that it comprises; 0.1 to 1% by weight of the third antioxidant
Paint composition for concrete protection and life extension. According to claim 1,
The emulsion composition is
70 to 90% by weight of acrylic emulsion;
5 to 15% by weight of silicone resin emulsion;
0.1 to 2% by weight of a dispersant;
0.02-0.2% by weight of a glidant;
0.1 to 2% by weight of an antifoaming agent;
0.5 to 2% by weight of a film-forming aid; and
The remainder of the water;
The powder composition is
85-95% by weight of cement; and
5 to 15% by weight of quicklime; characterized in that it comprises
Paint composition for concrete protection and life extension. delete delete According to claim 1,
Characterized in that the one-end silicone is polydimethylsiloxane having a methacryloxy group bonded to one end
Paint composition for concrete protection and life extension. Forming a first coating layer by coating the first composition according to any one of claims 1, 2 and 5 on the surface of concrete to form a first coating layer; and
A second coating layer forming step of forming a second coating layer by coating the second composition according to any one of claims 1, 2, and 5 on the first coating layer; characterized in that it comprises a
Coating method for concrete protection and life extension. According to claim 6,
The coating method for protecting and extending the life of the concrete
A pretreatment step of removing at least one of a foreign substance and an old coating film present in an area to be painted; and
characterized in that it further comprises a; repair step of repairing the cracked portion
Coating method for concrete protection and life extension.

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